mmc: Allow host drivers to specify max block count

Many controllers have an upper limit on the number of blocks that can be
transferred in one request. Allow the host drivers to specify this and make
sure we avoid hitting this limit.

Also change the max_sectors field to avoid confusion. This makes it map
less directly to the block layer limits, but as they didn't apply directly
on MMC cards anyway, this isn't a great loss.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 2da0c918a8cc..913e5752569f 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -92,9 +92,10 @@ struct mmc_host {
         unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
         unsigned short          max_hw_segs;    /* see blk_queue_max_hw_segments */
         unsigned short          max_phys_segs;  /* see blk_queue_max_phys_segments */
-        unsigned short          max_sectors;    /* see blk_queue_max_sectors */
         unsigned short          unused;
+        unsigned int            max_req_size;   /* maximum number of bytes in one req */
         unsigned int            max_blk_size;   /* maximum size of one mmc block */
+        unsigned int            max_blk_count;  /* maximum number of blocks in one req */
 
         /* private data */
         struct mmc_ios          ios;            /* current io bus settings */